I've got 2 friends with SS4000s. One absolutely hates it. One is a bracket racer and he even thinks it's a little too big, but he did go 11.16 with a h/c and about 250 lbs off of the car. I'd say go with the 3600. It's the best of both worlds.

 

ive got a 35-3600 with the mods in my sig and then some and im going to 4k, the bigger the better, or youll regret it like me just my .02

 

Drove my friend's bolt-on car with an SS4000 around for a while, loved it. Hell, I'd daily it with that 4000, especially how it ran cam only. However, if it were mine and wasn't a daily, I'd definitely be going bigger, like 4400.

 

I hear big stalls hurt tranny .

 

Ss3600

 

I have the ss4000 in my car and its my daily. I put about 350-400 miles on my car a week. And until recently I had the stock 3.23's, I have 3.73's now and it is tighter. It does take some getting used to, but I will never go back to a smaller converter.

Just make sure you get a transmission cooler no matter which one you decide.